Malicious PDF — malware analysis report

Static analysis result for SHA-256 285b108ed716e194…

MALICIOUS

PDF

80.0 KB Created: 2021-03-23 10:42:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a4c0390e062cfda31a3f9263024377e SHA-1: d62044de2ae5566fd2497b3290e32807949056b5 SHA-256: 285b108ed716e194142a5745fac6261d371806f871ff408e7129e55f961fd85d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are disguised as search results for educational materials, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by presenting numerous URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://botokaw.ru/award?keyword=biology+class+9+pdf+free+download
    • https://tuwunofibe.weebly.com/uploads/1/3/4/6/134657164/dfb20b.pdf
    • https://dorixakogika.weebly.com/uploads/1/3/6/0/136051108/faxoziwekepa-wiselagujuk-zoxamore.pdf
    • https://xuvelusikifaza.weebly.com/uploads/1/3/1/4/131406656/morebavufen-norikesiwapo-gelesunodagi-naleji.pdf
    • https://cdn-cms.f-static.net/uploads/4444626/normal_603f370818d53.pdf
    • https://xalitizamer.weebly.com/uploads/1/3/4/8/134863297/0a13a60b6e1e2.pdf
    • https://cdn-cms.f-static.net/uploads/4473322/normal_5fd1adb18a734.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wewuxuviwar/bahubali_1080p_movie_in_tamil.pdf
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_299bbf4b7f164a1181d0e087f01db8b0.pdf?index=true
    • https://s3.amazonaws.com/safenalavojuwu/hidroxido_de_aluminio_y_magnesio.pdf
    • https://s3.amazonaws.com/gogoxowiniza/danby_designer_portable_dishwasher_manual.pdf
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_ed5f131b51c848ab93479890d2167676.pdf?index=true
    • https://s3.amazonaws.com/mejados/eset_internet_security_trial_key_2021.pdf
    • https://s3.amazonaws.com/suxuzubojut/25302437327.pdf
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_41ba7f599436424b842d198a508ec221.pdf?index=true
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_ce8580cb367440d29f30c176b8c02a30.pdf?index=true
    • https://s3.amazonaws.com/niwotipugonuvoz/7185861998.pdf
    • https://s3.amazonaws.com/mukutud/crane_cool_mist_humidifier_no_mistaire.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed3f.bin
27f3cc661b5cabc38c53adfdce188f04db9faa0f792cda9e712732ec268ebac7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED3F 5428 bytes
font_01_sfnt_off0000ffcc.bin
41ff16d2ed99a956949c929012525fa5482951be1021ed76efe9ea6472b470a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCC 10768 bytes
font_02_sfnt_off00012481.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12481 4324 bytes

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